Improve multi-Module support

[pq]

As mentioned by @matejthetree in #1889, setting up projects with multiple modules currently requires some heroics. For example, see https://github.com/apptreesoftware/letsvote#intellj-multi-module-setup which has these directions.

IntellJ multi-module setup
It is convenient to have a single project that contains each sub-project as a module.

open project settings (cmd+;)
open "Modules" page
remove the exisiting module
click "+" and select letsvote_mobile.iml file
click "+" and select letsvote_web.iml file
click "+" and select letsvote_server.iml file
After Step 3 Intellij will need the Flutter SDK to be set again. Go to Preferences (cmd+,) and re-select your flutter SDK path

We should make this better...

cc @jwren @alexander-doroshko

[Andrious]

The 'stackoverflow community' don't seem to understand what I'm asking and put my question on hold:
Add 'Modules' to a Flutter Project in Android Studio [on hold]

However, I found this issue posted a year ago, today. Please, I can't make heads or tails of it. Has this been resolved? If it has, I still can't figure out how to allow for 'multiple modules' in a Flutter project.

Regards,

Greg

[pq]

This actually just came up in #3257 as well.

The short story is that it's still a very manual process. As @matejthetree describes, you need to manually add each module to the project's settings.

In a more ideal world, this could happen as part of project import.

[neokree]

Other than this issue, I would report that when multi module support is active, there are some strange behaviours with the VCS plugin (I'm using git).

Some of the problems reported are:

• Changes are showed as file but not in line (colors at the left of the writing panel)
• Files with changes, after changing tab, disappears from changes list

These issues go away after a VCS -> Refresh file status, but it is far from optimal.

[MisterJimson]

I also find that syntax highlighting, autocomplete and dartfmt doesn’t always work with muti module project, and generally I see a lot of issues whenever I try to use them.

Here is a video of what I have been trying to fix for about 2 hours: https://www.youtube.com/watch?v=qGkT4_qZ5Yo